mirror of
https://github.com/cocos/cocos-engine.git
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62d8b4daae
The operation of swapping (presenting) buffers is done in gfx::Device::present. To swap multi-systemwindows, multiple gfx swapchains need be created, and relevant gfx backend will iterate each swapchain and present them. Therefore, `swap buffers` operation doesn't need to be in SystemWindow or SystemWindowManager.
```c++
void GLES3Device::present() {
CC_PROFILE(GLES3DevicePresent);
auto *queue = static_cast<GLES3Queue *>(_queue);
_numDrawCalls = queue->_numDrawCalls;
_numInstances = queue->_numInstances;
_numTriangles = queue->_numTriangles;
bool isGFXDeviceNeedsPresent = _xr ? _xr->isGFXDeviceNeedsPresent(_api) : true;
for (auto *swapchain : _swapchains) { // We iterate each swapchain and do the present thing here.
if (isGFXDeviceNeedsPresent) _gpuContext->present(swapchain);
}
if (_xr) _xr->postGFXDevicePresent(_api);
// Clear queue stats
queue->_numDrawCalls = 0;
queue->_numInstances = 0;
queue->_numTriangles = 0;
}
```
Besides, `SDL_GL_SwapWindow` invocation is doing nothing on Windows & Linux platforms, it will generate an SDL an error that `The specified window isn't an OpenGL window` because GL context is not created by SDL_GL_CreateContext. We create contexts in our gfx code.
https://github.com/libsdl-org/SDL/blob/main/src/video/SDL_video.c#L4192
```c++
#define NOT_AN_OPENGL_WINDOW "The specified window isn't an OpenGL window"
int
SDL_GL_SwapWindowWithResult(SDL_Window * window)
{
CHECK_WINDOW_MAGIC(window, -1);
if (!(window->flags & SDL_WINDOW_OPENGL)) {
return SDL_SetError(NOT_AN_OPENGL_WINDOW);
}
if (SDL_GL_GetCurrentWindow() != window) {
return SDL_SetError("The specified window has not been made current");
}
return _this->GL_SwapWindow(_this, window);
}
void
SDL_GL_SwapWindow(SDL_Window * window)
{
SDL_GL_SwapWindowWithResult(window);
}
```
Also, SDL_GL_SwapWindow could not take any effect if running on gfx Vulkan backend.
```c++
void SDLHelper::swapWindow(SDL_Window *window) {
SDL_GL_SwapWindow(window);
}
```
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/****************************************************************************
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Copyright (c) 2021-2022 Xiamen Yaji Software Co., Ltd.
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http://www.cocos.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated engine source code (the "Software"), a limited,
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worldwide, royalty-free, non-assignable, revocable and non-exclusive license
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to use Cocos Creator solely to develop games on your target platforms. You shall
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not use Cocos Creator software for developing other software or tools that's
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used for developing games. You are not granted to publish, distribute,
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sublicense, and/or sell copies of Cocos Creator.
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The software or tools in this License Agreement are licensed, not sold.
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Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "platform/linux/LinuxPlatform.h"
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#include <sys/time.h>
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#include <unistd.h>
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#include "platform/SDLHelper.h"
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#include "modules/Accelerometer.h"
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#include "modules/Battery.h"
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#include "modules/Network.h"
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#include "modules/System.h"
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#include "modules/Vibrator.h"
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#if defined(CC_SERVER_MODE)
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#include "platform/empty/modules/Screen.h"
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#include "platform/empty/modules/SystemWindow.h"
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#include "platform/empty/modules/SystemWindowManager.h"
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#else
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#include "modules/Screen.h"
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#include "modules/SystemWindow.h"
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#include "modules/SystemWindowManager.h"
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#endif
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#include "base/memory/Memory.h"
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namespace {
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} // namespace
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namespace cc {
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LinuxPlatform::LinuxPlatform() {
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}
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LinuxPlatform::~LinuxPlatform() {
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}
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int32_t LinuxPlatform::init() {
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registerInterface(std::make_shared<Accelerometer>());
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registerInterface(std::make_shared<Battery>());
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registerInterface(std::make_shared<Network>());
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registerInterface(std::make_shared<Screen>());
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registerInterface(std::make_shared<System>());
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_windowManager = std::make_shared<SystemWindowManager>();
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registerInterface(_windowManager);
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registerInterface(std::make_shared<Vibrator>());
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return _windowManager->init();
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}
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ISystemWindow *LinuxPlatform::createNativeWindow(uint32_t windowId, void *externalHandle) {
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return ccnew SystemWindow(windowId, externalHandle);
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}
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static long getCurrentMillSecond() {
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long lLastTime;
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struct timeval stCurrentTime;
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gettimeofday(&stCurrentTime, NULL);
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lLastTime = stCurrentTime.tv_sec * 1000 + stCurrentTime.tv_usec * 0.001; // milliseconds
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return lLastTime;
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}
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int32_t LinuxPlatform::loop() {
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long lastTime = 0L;
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long curTime = 0L;
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long desiredInterval = 0L;
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long actualInterval = 0L;
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onResume();
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while (!_quit) {
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curTime = getCurrentMillSecond();
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desiredInterval = static_cast<long>(1000.0 / getFps());
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_windowManager->processEvent(&_quit);
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actualInterval = curTime - lastTime;
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if (actualInterval >= desiredInterval) {
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lastTime = getCurrentMillSecond();
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runTask();
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} else {
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usleep((desiredInterval - curTime + lastTime) * 1000);
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}
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}
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onDestroy();
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return 0;
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}
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} // namespace cc
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